Android video recording never getting started to the Getting Started Series tutorial (ii) ———— display video images

1. Create an empty project, and notice the following permissions:

<android:name= "Android.permission.CAMERA"/><   android:name= "Android.permission.WRITE_EXTERNAL_STORAGE"/>

2. layout file

<?XML version= "1.0" encoding= "Utf-8"?><Framelayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent">    <SurfaceviewAndroid:id= "@+id/surfaceview"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"/></Framelayout>

Very simply, put a surfaceview to display the video image.

3. Initialize the camera

Private void Initcamera () {     = camera.open ();}

Using the camera's open method, the Open method also has an overloaded method, which is mainly used to tell the system which camera I want to open, and now the phone is usually more than two camera heads. The rear camera is turned on by default.

4. Release the camera

Private void Releasecamera () {    ifnull)    {        //  stop preview before releasing        Camera.setpreviewcallback (null);        Camera.stoppreview ();        Camera.release ();         NULL ;    }}

Here are some of the more important methods, the following is the code for the entire activity:

 Public classMainactivityextendsappcompatactivity{Privatecamera camera; PrivateSurfaceview Surfaceview; @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main); Surfaceview=(Surfaceview) Findviewbyid (R.id.surfaceview); } @Overrideprotected voidOnStart () {Super. OnStart ();        Initcamera (); Surfaceview.getholder (). Addcallback (NewSurfaceholder.callback () {@Override Public voidsurfacecreated (Surfaceholder holder) {Holder.removecallback ( This); Try{camera.setpreviewdisplay (holder);                Camera.startpreview (); }                Catch(IOException e) {e.printstacktrace (); }} @Override Public voidSurfacechanged (Surfaceholder holder,intFormatintWidthintheight) {} @Override Public voidsurfacedestroyed (Surfaceholder holder) {}}); } @Overrideprotected voidOnStop () {Super. OnStop ();    Releasecamera (); }    Private voidInitcamera () {camera=Camera.open (); }        Private voidReleasecamera () {if(Camera! =NULL)        {            //Stop preview before releasingCamera.setpreviewcallback (NULL);            Camera.stoppreview ();            Camera.release (); Camera=NULL; }    }}

It is worth mentioning that the camera's Startpreview method needs to be called after Surfaceviewholder is created, otherwise the video image will not be displayed in Surfaceview.

This article is a demo download.

Android video recording never getting started to the Getting Started Series tutorial (ii) ———— display video images